Inverted device architecture for high efficiency single-layer organic light-emitting diodes with imbalanced charge transport

Many wide-gap organic semiconductors exhibit imbalanced electron and hole transport, therefore efficient organic light-emitting diodes require a multilayer architecture of electron- and hole-transport materials to confine charge recombination to the emissive layer. Here, we show that even for emitte...

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Bibliographic Details
Published in:Nature communications 2024-05, Vol.15 (1), p.4107-4107, Article 4107
Main Authors: Tan, Xiao, Dou, Dehai, Chua, Lay-Lay, Png, Rui-Qi, Congrave, Daniel G., Bronstein, Hugo, Baumgarten, Martin, Li, Yungui, Blom, Paul W. M., Wetzelaer, Gert-Jan A. H.
Format: Article
Language:English
Subjects:
132/122
639/301/1019/1020/1091
639/766/1130
Charge materials
Charge transport
Efficiency
Emitters
Humanities and Social Sciences
Monolayers
multidisciplinary
Multilayers
Organic light emitting diodes
Organic semiconductors
Quantum efficiency
Recombination
Science
Science (multidisciplinary)
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Summary:Many wide-gap organic semiconductors exhibit imbalanced electron and hole transport, therefore efficient organic light-emitting diodes require a multilayer architecture of electron- and hole-transport materials to confine charge recombination to the emissive layer. Here, we show that even for emitters with imbalanced charge transport, it is possible to obtain highly efficient single-layer organic light emitting diodes (OLEDs), without the need for additional charge-transport and blocking layers. For hole-dominated emitters, an inverted single-layer device architecture with ohmic bottom-electron and top-hole contacts moves the emission zone away from the metal top electrode, thereby more than doubling the optical outcoupling efficiency. Finally, a blue-emitting inverted single-layer OLED based on thermally activated delayed fluorescence is achieved, exhibiting a high external quantum efficiency of 19% with little roll-off at high brightness, demonstrating that balanced charge transport is not a prerequisite for highly efficient single-layer OLEDs. Efficient organic light-emitting diodes require a multilayer architecture to confine charge recombination to the emissive layer. Here, authors demonstrate efficient single-layer devices for emitters with imbalanced charge transport without the need of additional charge transport or blocking layers.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-48553-1